Add scripts to enable Tycho build

This CL adds all the required files to perform a build
using Tycho. It is not integrated into the Android build
system though. In order to perform a build, make sure your
repository has the git projects prebuilts/eclipse and
prebuilts/eclipse-build-deps, then do:

 $ cd sdk/eclipse
 $ make -f maven.mk

That should create the necessary target platform and start
a build using Maven/Tycho. The resulting artifacts should
be in out/host/maven/bundles-<version>/products

Change-Id: I4672cd9ea1ac072a9b5ddb27d98a9849b2a2b8cb
51 files changed